To be a parent is to be compromised. You pledge allegiance to justice for all, you swear that private attachments can rhyme with the public good, but when the choice comes down to your child or an abstraction—even the well-being of children…

Here is a science-fiction scenario: Imagine a strange new virus that incapacitates everybody below the age of 75. The virus wipes out the entire political leadership, except one old man, who has survived on account of his age, but may also be too…

ONE WEEK IN early March, on a blustery, windswept day, Fabiano Caruana decides to get away. He drives three hours west from his St. Louis apartment over winding gravel roads to reach his destination, a 2,000-acre compound in rural Missouri owned by…

Abstract: The (3x+1)-Map, T, acts on the set, Pi, of positive integers not divisible by 2 or 3. It is defined by T(x) = (3x+1)/2^k, where k is the largest integer for which T(x) is an integer. The (3x+1)-Conjecture asks if for every x in Pi there…